danger!!!! dont take your local land rover dealers word for it!!!! took the miss-fire petrol pig to the local land rover dealer for them to plug it into their childs v-tec computor, thay told me it would need 2 cats, 2 lambda sensors, air-flow meter, gear switch, fuel temp sensor, coolant sensor and that well known cause off a miss-fire a tyre!! i paid robin hood for time they spent dreaming up what they could spank me for and chugged out in my lumpy disco. i put a new tyre on and was gutted when the miss was still there. the next day i took it to my wifes work (a local toyota dealer) where one off the tecs said he would take a look in his dinner hour. 20mins later he found the fault lay within the wiring for the gas switch over. now all 8 are on demand!!!! thanxs for all the help and a tip for you all, use land rover dealers after lotto wins!!!!